Re: Apple IIc expansion options

["Deacon Blue" <scavenger@apexmail.com>]

Video expansion:

--> Video-7 Enhancer is a 'must' for driving a digital TTL RGB monitor if
you plan to use a colour output.  Colour-composite has lower-quality
reproduction.

regards




"Charles Stephens" <charles_stephens@hotmail.com> wrote in message
news:kKUD5.102$x%4.187390@news.pacbell.net...
> There is always the SmartPort.
>
> cfs
>
>
> "David Empson" <dempson@actrix.gen.nz> wrote in message
> 1ei75j7.xwbq9s15lw2rkN%dempson@actrix.gen.nz">news:1ei75j7.xwbq9s15lw2rkN%dempson@actrix.gen.nz...
> > **** **** <***@***.com> wrote:
> >
> > >     What are the expansion options available on the 2c?
> >
> > Nearly all expansion options are external.
> >
> > Applied Engineering did a memory expansion card which operates like the
> > RamWorks (multi-bank auxiliary memory).  This plugs into the CPU and MMU
> > sockets, and those chips then plug into the card.
> >
> > Later revisions of the IIc have a dedicated memory expansion slot, for
> > Apple's IIc memory expansion card, which works like Apple's standard
> > slot RAM card for the II+/IIe, i.e. a "slinky".  The motherboard
> > contains all the firmware support - the card is almost purely RAM with
> > very little support circuitry required (probably one ASIC to implement
> > the "slinky" address latch).
> >
> > You can also use a Zip Chip or Rocket Chip to accelerate the CPU.
> >
> > The IIc+ has a modem slot, but I don't know if anything was ever made to
> > go in it.  It ties into the slot 2 hardware (making use of the existing
> > 6551 on the motherboard), and I expect the external modem port would be
> > disconnected automatically if you plug in an internal modem.
> >
> > > I'm somewhat familiar with what can be done externally, and I realize
> that
> > > there are no internal slots. Are these slots totally absent from the
> > > design, or are the sockets simply missing from the mainboard?
> >
> > The motherboard hardware emulates the slots, in that you have I/O
> > devices and firmware which appear to be in slots 1-7 as far as the
> > software is concerned.  Most of the physical slot signals are missing.
> > For example, there are no IOSEL or IOSTROBE signals - the IIc uses a
> > single ROM that is enabled for all locations in $C100-$FFFF.  (The
> > "UniDisk" and later revisions also use bank switching to toggle the
> > entire ROM space between two 15.75 KB banks, to allow for extra code
> > like the SmartPort support and self-test.)
> >
> > The DEVSEL signals probably exist in some form, since there are I/O
> > devices in the address space for slots 1, 2 and 6.
> >
> > --
> > David Empson
> > dempson@actrix.gen.nz
> > Snail mail: P O Box 27-103, Wellington, New Zealand
> >
>
>